ML19308B022
| ML19308B022 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/04/1974 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19308B019 | List: |
| References | |
| RO-269-73-13, NUDOCS 7912120777 | |
| Download: ML19308B022 (1) | |
Text
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I DUKE POWER COMPANY OCONEE NUCLEAR STATION - UNIT 1 UNUSUAL EVENT REPORT UE-269/73-13
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ENGINEERED SAFEGUARDS VALVE LP-17 Description of the Incident on December 3, 1973, the monthly test of Engineered Safeguards Channel 3 was performed. During the performance of this test, low pressure injection Line A reactor building isolation valve LP-17 opened as would be required on Engineered Safeguards actuation. However, when an attempt was made to close the valve upon completion of the test, a fuse in the control power circuitry blew causing the valve to stop travel in a partially open position.
Regulatory Operations, Region II, was informed on the incident on December 3, 1973.
Corrective Action The control power fuse for Engineered Safeguards valve LP-17 was replaced and the circuitry was inspected to determine the cause of the blown fuse.
The fuse was not loose in its holder, nor could any loose, burned, or shorted wires be found.
The failure was evidently caused by a voltage surge or a weak fuse. After the fuse was replaced, the valve was successfully operated five times from Engineered Safeguards Channel 3.
Safety Analysis Redundancy for LP-17 is provided by LP-18 in the low pressure injection Line B.
Furthermore, LP-18 is opened by Engineered Safeguards Channel 4 as a part of low pressure injection initiation.
It is concluded that this incident did not affect the safe operation of the plant or the health and safety of the public.
i 7912120 /,,7 7